root/man/libc/setjmp.html

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<title>setjmp</title>
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<h2 align=center>setjmp</h2>
<h4 align=center>OS/161 Reference Manual</h4>

<h3>Name</h3>
setjmp, longjmp - non-local jump operations

<h3>Library</h3>
Standard C Library (libc, -lc)

<h3>Synopsis</h3>
#include &lt;setjmp.h&gt;<br>
<br>
int<br>
setjmp(jmp_buf <em>jb</em>);<br>
<br>
void<br>
longjmp(jmp_buf <em>jb</em>, int <em>returncode</em>);<br>

<h3>Description</h3>

setjmp saves the current stack frame and processor state in
<em>jb</em>. A subsequent call to longjmp with the same <em>jb</em>
causes execution to jump to where setjmp was called from.
<p>

If the stack frame that called setjmp returns before longjmp is
called, the results are undefined.
<p>

<h3>Return Values</h3>

When called, setjmp returns 0. When longjmp is called, it does not
itself return, but instead causes setjmp to appear to return again,
this time returning <em>returncode</em>.
<p>

If zero is passed <em>returncode</em>, it is forced to 1 instead.
<p>

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